Williams system 11B: Swords Of Fury
Having some trouble with pinpointing the issue of having no sound on my Swords of Fury.
First: The game works/plays 100% fine only with no sound. The sound worked fine until i swapped out the original power supply board with a Rottendog power supply board. On the initial power up there was no sound. Re-installed original power board and still no sound at all. The game boots /plays fine.
Below is a list of the troubleshooting,so far...
--- At power up of the game there is no " bong sound" for audio board.
--- no sound when SW 1 pressed on MPU
--- I have tried a known "good sound board" from my "Police Force"; with the sound chips switched out in Audio board. It still had no boot up sound or any sounds when playing.
--- The Audio board from Swords of Fury i installed in Police Force [ Roms swapped]and it booted fine but only the voices worked.
-- I swapped the J4 ribbon cable from Police force to rule out a faulty cable. Still no difference.
--- I swapped the J1 cable from from Police Force to rule out that cable. Still no difference.
--- All capacitors on sound board have been replaced . C1,C3,C4,C8,C12,C19,C24,C26,C30,C29,C32
--- The two Audio amps on sound board --U22 & U23 have been replaced with two new TDA2003's
--- i swapped chips U15 with U24 on the MPU . The game boots fine.
Could it be bad sound U21 or U22 on Mpu? or bad Sound Roms on Audio board ...or something else on MPU
Any advice would be appreciated...thanks